— Not at all. I'd be happy to.
A：Isn't it very cold today?
B：Are you feeling ill today?
C：Would you mind opening the window?
D：Have you bought the kite to me?
（1）若sinα=0.5138，则锐角α=____
（2）若2cosβ=0.7568，则锐角β=____
（3）若tanA=37.50，则∠A=____ （结果精确到1〞）
第二次世界大战使几千万人失去了生命，是人类历史上一次空前的浩劫。这个噩耗开始与彻底终止的时间是( )
